A hydraulic actuator is used to give a unidirectional force through a unidirectional stroke.
Hydraulic tools are high-powered tools that use pressurised fluid to operate hydraulic machinery.
Hydraulic actuators use liquid pressure rather than instrument air pressure to apply force on the diaphragm to move the valve actuator and then to position valve stem.
Nearly all hydraulic actuator designs use a piston rather than a diaphragm to convert fluid pressure into mechanical force.
